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Posted: Wed Oct 06, 2004 2:28 am Post subject: Daily Digest Sat Oct 2 23:00:02 2004
06 Oct., 2004
Here in the north-east (seismic zone V), it is our practice to have only 5 inch or 4.5 inch (half brick)thick walls in all buildings, even in office buildings. Lintel bands are provided to support the brick wall above the window or door openings. The lintels are usually cast after the slabs and beams above them are cast -- dowels are left in the columns for casting the lintels later. Thus, the pouring of concrete in the columns is not affected.
Good to know that walls with 40% or more openings will not contribute to story stiffness. Another way may be to introduce mastic fillers say 100 mm wide between the walls and the columns. This may reduce the stiffening effect of the walls and thereby preclude the open ground floor from behaving like a soft story.
It is a must for shear walls or any other bracing system right up to the foundation level. Interrupting such lateral load bearing elements is a sure way of inviting disaster.
Avoid grossly irregular buildings if you can.Such buildings may be divided into more regular ones by means of crumple joints -- widths properly designed and not set arbitrarily at 50 mm.
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